Question: When did the film "Metropolis" go into the Public Domain in the United States?
Paraphrase: The film "Metropolis" entered the American Public Domain in which year?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q151599 p:P3893 ?s . ?s ps:P3893 ?obj . ?s pq:P1001 wd:Q30 }